9. 20 - 4 = \n20 + 4\n20 + (-4)
9. 20 - 4 = \n20 + 4\n20 + (-4)
Answer
Explanation:
Step1: Recall subtraction rule
Subtracting a number is the same as adding its additive inverse. So, $a - b=a+( - b)$.
Step2: Apply rule to $20 - 4$
For $20 - 4$, according to the rule, it is equivalent to $20+( - 4)$.
Answer:
$20+( - 4)$